A one-parameter discrete music synthetic crowbar for the iPhone! Grid is an open source additive synthesis system ideal for rhythmic, melodic, or textural applications. The utility is broad, amplification is ideal.
But has joy gone blind? No; there are primary colors in sound. There are primitives to sound, to the psychological constituents of sound; though there is a one to one correspondence between frequency and the reals, frequency is a property rather than a depiction of palpable tone. In this sense, the algorithm used is structurally formative rather than exhaustively descriptive of the sounds produced.
Grid is open source. You can get the code here.